Take a bowl and put in the flour, sugar, salt and baking soda together. Mix them well together.
Next, pour in the oil and combine it well with the rest of the ingredients. Now add in the curd alongwith water and knead into a soft dough.
Cover the dough and keep aside for 30 minutes. After this time period, divide the dough into equal portions and make ball shapes.
Then, roll the dough balls into thick and round shapes. Sprinkle a few nigella seeds and roll it so that it is evenly spread over the kulcha.
Flip the roti over and then brush the other side with water.
Place the water side over a hot tawa, as soon as some bubbles start forming, put the tawa upside down so that the kulcha gets directly cooked on the flame.
Once the kulcha is cooked, you will see some black spots on top of it. Transfer the kulcha to a plate and spread the butter on top.
Serve hot alongside chole and a green salad.